What is SDLC? Software Development Life Cycle Phases, Methodologies, and Processes Explained

This methodology is used for large, extremely complex projects and has even been used outside of software development. Secure SDLC (or SSDLC) is a software life cycle with fully integrated security checks at every phase. Teams start thinking about security risks and measures during the first stage of the SDLC.

sdlc software development life cycle

The goal of the SDLC life cycle model is to deliver high-quality, maintainable software that meets the user’s requirements. In addition to the waterfall model’s linear sequence of stages, the V-Model includes a testing phase for each development phase. The phases are sequential with the testing phases running concurrently with the development phases. This model is appropriate for projects with a high risk of errors and when the requirements are clear and the cost and timeline aren’t key issues. Due to increasing cyberattacks and security breaches, development teams are under pressure to improve application security. SDLC security is a set of processes that incorporate robust security measures and testing into the SDLC.

What are SDLC models?

An SDLC outlines a detailed, step-by-step plan for software development. The practice speeds up decision-making during product creation and minimizes risks while keeping all teams (and stakeholders) on the same page. This process goes on until customers have no more negative feedback, after which the team gets a customer-driven requirements analysis and starts developing the final product.

  • This phase focuses on enhancements, delivering changes, or fixing any defects and issues that may arise.
  • It lacks the thorough requirements definition stage of the other methods.
  • By anticipating costly mistakes like failing to ask the end-user or client for feedback, SLDC can eliminate redundant rework and after-the-fact fixes.
  • The team produces a new software version at the end of each iteration.

It is conducted by the senior team members with inputs from all the stakeholders and domain experts in the industry. Planning for the quality assurance requirements and recognization of the risks involved is also done at this stage. The most flexible of the SDLC models, the spiral model is similar to the iterative model in its emphasis on repetition. The spiral model goes through the planning, design, build and test phases over and over, with gradual improvements at each pass. DevOps follows the lean and agile SDLC methodologies and emphasizes collaboration. Throughout the entire SDLC, developers, IT operations staff, and security teams regularly communicate and work together to ensure successful project delivery.

How to choose a programming language to learn

Fundamentally, SDLC trades flexibility for control by imposing structure. It is more commonly used for large scale projects with many developers. Baselines[clarification needed] are established after four of the five phases of the SDLC, and are critical to the iterative nature of the model.[23] Baselines become milestones.

sdlc software development life cycle

One big disadvantage here is that it can eat up resources fast if left unchecked. “Let’s get this closer to what we want.” The plan almost never turns out perfect when it meets reality. Further, as conditions in the real world change, we need to update and advance the software to match. This allows any stakeholders to safely play with the product before releasing it to the market.

SDLC vs. DevOps

Each phase must be completed before moving onto the next, which prohibits overlapping. After successfully building the software, the team coordinates with the product manager to deploy the software to production. The designers pass the requirements to create a very detailed prototype that covers every aspect of the user journey. The prototype should cover all possible cases, including error messages, status, and interactions.

The testing stage ends when the product is stable, free of bugs, and up to quality standards defined in the previous phases. In this phase, the development team talks with stakeholders such as; the project manager, users, customers, and sponsors in order to gather all software requirements. Brainstorming sessions, interviews, surveys, or questionnaires could all be used to do this.

Benefits of the SDLC

The system typically consists of several hardware and software components that work together to perform complex functions. They analyze the requirements to identify smaller coding tasks they can do daily to achieve the final result. Before releasing the mockups into final production, you’ll need to test it to ensure it is free of bugs and errors. You’ll also need to manage how the system will integrate into existing systems, software, and processes.

It should be noted that this approach is not recommended for larger/longer lasting projects because of the aforementioned rigidity. This approach is simple in its structure – finish all parts of a phase before moving on to the next phase with more momentum building towards the project finish as stages are completed. Each stage’s beginning (except for the first) and completion is contingent on the previous stage’s completion/transfer of information. Amplifying learning allows teams to reinvest in their ability to deliver products to customers. I’ve had some time to think about the differences (and similarities) each of these approaches offer. At their core, each is focused on delivering high quality software as efficiently and as cost effectively as possible.

Teams follow the SDLC to help them plan, analyze, design, test, deploy, and maintain software. The SDLC also helps teams ensure that the software meets stakeholder requirements and adheres to the organization’s standards for quality, security, and compliance. The SDLC also helps teams ensure that the software meets stakeholder requirements and adheres to their organization’s standards for quality, security, and compliance. The phases are overlapped with both the development and testing activities occurring concurrently unlike the Waterfall model. This model is suitable for projects with changing requirements or that require rapid development.

sdlc software development life cycle

My friend wanted to start the a company and reached out to me and others for guidance. I advised him to use SDLC to first perform a requirements analysis even though his ambitions software development life cycle definition were quite large. Software development – as we all know – is a broad domain and can cover website design tools and online forms to more robust machine learning or backend systems.

Integration and testing

It can also include adding new features or functionality to a current product. Operations refer to the day-to-day running of a software product or service, such as performing backups and other administrative tasks. The spiral model in SDLC is one of the most crucial SDLC models that provides support for risk handling. It has various spirals in its diagrammatic representation; the number of spirals depends upon the type of project. Each loop in the spiral structure indicates the Phases of the Spiral model.

sdlc software development life cycle

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